Cluster Refresh Page: Catch GanetiAPIErrors

Now catches GanetiAPIError exceptions and passes the message to the user.

refs #15513
Merge branch 'bug/15513' into develop

* bug/15513:
  Cluster Refresh Page: Catch GanetiAPIErrors
Trim down README.
README: Add instructions on how to build documentation
Add requirements/docs.txt for just documentation dependencies
Add link to RTD at top of README.
Remove unncessary comma
Updated bundled cytoscape.js version in ganetiviz, to 2.0.4 (latest)
Refs #15657
Add summary to end of VM Wizard

Split the templates up a lot to use inheritance a bit better. Makes using a
different template for different forms easier.

Moved moved helptips out into its own file and made some changes to fix some
CSS breakage I caused. Now the current helpTip() function works with the older
style helptips, and the initHelpTip() function can probably removed.

refs #11943
Hide extra nic inputs dynamically.

refs #11943
Updated summary page to group info into wizard's steps
Merge branch 'enhancement/11943' into develop

* enhancement/11943:
  Updated summary page to group info into wizard's steps
  Hide extra nic inputs dynamically.
  Add summary to end of VM Wizard
Merge branch 'pramttl-enhancement/15657' into develop

* pramttl-enhancement/15657:
  Updated bundled cytoscape.js version in ganetiviz, to 2.0.4 (latest) Refs #15657
Merge branch 'bug/15195' into develop

* bug/15195:
  Remove unncessary comma
  Add link to RTD at top of README.
  Add requirements/docs.txt for just documentation dependencies
  README: Add instructions on how to build documentation
  Trim down README.
Update documentation

Remove empty files.

Re-arrange doc structure.

Fix references.
Merge branch 'enhancement/13785_squashed' into develop

* enhancement/13785_squashed:
  Update documentation
Add release process docs

refs #16089
Add release doc to index

refs #16089
Merge branch 'enhancement/16089' into develop

* enhancement/16089:
  Add release doc to index
  Add release process docs
requirements: Update django_object_log version.